ISOTOPIC ANOMALIES IN A URANIUM CLUSTER FORMED BY LAIS

J. van de Walle, R. J. Tarento and P. Joyes
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J. van de Walle: Laboratoire de Physique des Solides, Université Paris–Sud, 91405 Orsay, France
R. J. Tarento: Laboratoire de Physique des Solides, Université Paris–Sud, 91405 Orsay, France
P. Joyes: Laboratoire de Physique des Solides, Université Paris–Sud, 91405 Orsay, France

Surface Review and Letters (SRL), 1999, vol. 06, issue 03n04, 307-312

Abstract: A study of a Au–U liquid alloy ion source (LAIS) where uranium is enriched in its lighter element (20%235U, 80%238U) has been performed by high resolution mass spectrometry. Monoatomic species Au+, Au2+, U2+, U3+and polyatomic species${\rm Au}^+_n$,${\rm U}^{p+}_n$,AunU+are observed. The monoatomic results are well explained by the Kingham postionization process.${\rm Au}^+_n$andAunU+species present an interesting odd–even effect characteristic of monovalent elements. The main result of this preliminary letter is a heteroisotope anomaly which appears in${\rm U}^+_2$,${\rm U}^+_3$and${\rm U}^{4+}_3$emission where only homoisotopes are detected. A similar phenomenon was reported for${\rm Cu}^+_2$and${\rm Ge}^+_2$in a previous work and was attributed to a higher state of excitation of emitted heteroisotope aggregates which explode as they fly to the collector.1,2

Date: 1999
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DOI: 10.1142/S0218625X99000299

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